Sewing machine



Sept. 8, 1936.

w. MYEs SEWING MACHINE Filed July 26, 1934 2 Sheets-Sheet 1 k lllll Illlllllll IIIIILJ Sept. 8, 1936. w. MYERS 2,053,968

sEwVING MACHINE Filed July 26, 1934 2 Sheets-Sheet 2 Patented Sept. 8,1936 UNITED STATES SEWING MACHINE VWalter Myers, Bridgeport, Conn.,assigner to The Singer Manufacturing Company, N. J., a corporation ofNew Jersey Elizabeth,

Application July 26, 1934, Serial No. 737,002

18 Claims.

This invention relates to improvements in sewing machines and has forits primary object to provide a sewing machine with improved oil-tightmeans whereby an operative or controlling member may be actuated fromthe exterior of and through the sewing machine frame or the casing of amechanism-housing chamber of a sewing machine. From another aspect, theinvention has for an object to provide means, which is completelyoil-tight, for transmitting motion through the frame or amechanism-housing casing of a sewing machine.

The invention also aims to provide improved means, devoid of workingjoints, for transmitting motion through the frame or a mechanism-housingcasing of a sewing machine. A morespecic `object of the invention is toprovide improved means for effecting adjustment of a sewing machineeccentric housed within a chamber provided in the sewing machine frame.

With the above and other more specific objects in view, the inventionconsists in the devices, combinations and arrangements of partshereinafter described in connection with the accompanying drawings whichillustrate a preferred embodiment of the invention, from which theseveral features of the invention and the advantages attained therebywill be readily understood by those skilled in the art.

In the accompanying drawings, Fig. 1 is a top plan view of the work-armoi a feed-oiT-arm sewing machine, with the carrier-arm for said work-Yarm broken away. Fig. 2 represents a longitudinal section of theWork-arm. Fig. 3 represents a transverse section of the work-arm in avertical plane substantially through the actuating shaft for thefeed andloop-takers. Fig. 4 is a detail View of the adjusting member from therecessed side face thereof. Fig. 5 represents a sectional view of theadjustable eccentric, substantially on the line 5-5 of Fig. 4.

The drawings illustrate the present improvement as embodied in afeed-off-arm sewing machine'such as shown and described in my priorpatent application Serial No. 627,409, led August 4, 1932. The sewingmachine shown in the draw--I ings has a frame including a hollowwork-arm I supported by a carrier-arm 2 which is coplanar with thework-arm. The work-arm I comprises a trough-shaped casing, closed at itstop by a removable cover-plate 3, a throat-plate 4, and swing-outcover-plates 5 disposed at opposite sides of the throat-plate 4.

Journaled in the carrier-arm 2 and extending within and transversely ofthe work-arm I is a `tutes a driving connection compelling rotation ofrotary actuating shaft 6 journaled at one end in a ball-bearing I in thework-arm. Carried by the shaft Ii are bevel-gears 8 and 9 connected todriving mechanisms for loop-takers I and Il, disposed within and at thefree end of the workarm I for cooperation with a pair of needles I2 inthe formation of stitches.

The work is advanced longitudinally of the work-arm I and oii the freeend thereof by a feed-dog I3, operating through the suitably slottedthroat-plate 4 and opposed by a presser-foot I4. The feed-dog I3 iscarried by one end of a feed-bar I extending longitudinally of andwithin the work-arm I, said feed-bar being suitably fulcrumed forrocking and endwise movements upon a bracket i6 Within the work-arm.

In order to impart rocking movements to the feed-bar I 5, and therebyrising and falling movements to the feed-dog I3, said feed-bar at itsend opposite to the feed-dog is provided witha fork I 'I slidinglystraddling a block I8 embracing a feedlift eccentric I 9 suitablysecured upon the rotary actuating shaft 6 within the work-arm. The forkI'l is oiiset laterally of the feed-bar I5 and, in the present case,visformed. integral with said"2`5 feed-bar by laterally bending thefeed-bar.

Secured, by screws 20, upon the feed-bar I5 for adjustment lengthwisethereof, is the shank 2I of a fork 22 slidingly straddling a block 23embracing a feed-advance eccentric 24, the fork 22 extendingtransversely of the feed-lift fork II. The feed-advance eccentric 24 issecured upon the shaft 6, within the work-arm, for adjustment ,of theeccentricity of the eccentric, the arrangein the present machinecorresponding substantiallywith the disclosure in the U. S. Patent to A.Grieb, No. 1,605,937, November 9, 1926.

' In general, the eccentric 24 embraces an adjusting eccentric 25, whichin turn embraces the shaft 6 for rotary adjustment thereupon. Theeccentric 24 has a ange 26 provided with a radial slot 21 slidinglyentered by a pivot-block 28 carried by a shouldered anchor-pin 29projecting from a side face of a supporting disk 30. The disk 30 isseated upon thehub-extension 3I of the loop-taker actuating bevel-gear 8and is suitably secured to said bevel-gear for rotation therewith.Consequently, the anchor-pin 29 constithe eccentric 24 with the shaft 6.

The anchor-pin 29 extends loosely through an arcuate slot 32 provided ina ange 33 of the adjusting eccentric 25, the flange 33 being dis-V posedbetween the ange 26 of the eccentric 24 55 and the supporting disk 30.The adjusting member, comprising the eccentric and its ange 33, issecured to the supporting disk for rotation therewith during the normaloperation of the machine, but in a manner permitting relative rotationof said adjusting member and supporting disk for purposes of adjustmentof the eccentricity of the eccentric 24. To that end, the side face ofthe adjusting-member vflange l33, adjacent to the eccentric-flange 26,is provided with a circular groove 34 affording a clearance recess for africti0n-plate 35 and the heads fof screws 36 passing freely through the.arcuate slot 32 in the flange 33, which screws 36 are threaded into thesupporting disk30. 'Frictionwashers 31 are interposed between thefriction plate and the heads of the screws 3B.

The ange 33 of the adjusting -member .is peripherally provided with astop-notch 38 adapted to receive a detent which is manually oper- .ableVto Vhold saidadjusting .memberiagainst rotation. vIt isa lspecificobject of the Vpresentinvention..to provide oil-.tight.means, free Vofworkingjoints, whereby said detent .may be operated from the exteriorand-through the wall of the workfarm.

The improved detent lhas a button orvhead 39 .loosely disposedormovement in an-aperture 4U .provided .in a .wall .of the work-arm 2,and in the present case in Ythevdetachable cover-plate 3 of saidWork-arm, saidhead 39 having athreaded shank `4I terminating in areduced tip 42 extending withinthe work-arm. The detent .shank 4l passesthrough an aperture provided in a-ex ible section ofthe work-arm walland comprising, in the present case, ailexible and preferably metallicdisk or circulardiaphragm 43, the detent being secured to said diaphragmby a nut 44 threaded upon 'the shank 4|. `Sealing washers 45 and '46 .atopposite sides ofthe diaphragm serve to render .the connection of thedetent with the diaphragm completely oil tight. It will be understood,of course, that the detentmay be formed integral with 'the viexiblewall-section or diaphragm'43. The diaphragmhas a rolled rim 41, securedby solder or other suitable means to the inner face'o'f the cover-'plate3, whereby the diaphragm is, in effect, integral throughout the rimthereof with vthe cover-plate 3 and thereby provides animperforateoil-tightfseal for the apertpre 40. To provide for lflexing 'thediaphragm, it is centrally arched so that its convex surface isproximate to the inner 'face'of the cover-plate and its concave face isopposed to the adjusting member 33, the detenttip 42 being therebynormally held clear of but in proximity to said adjusting member. 'I'hedetent head 39 is normally substantiallyflush with the outer face of thecover-plate, wherebyfit maybe conveniently actuated from the exterior ofthe Work-arm but doesnot obstruct handling of the work.

By pressing downwardly upon the detent-head 39, when the'stop-'notch 38of the eccentric adjusting member is directly under the detent tip 42,the ilexible diaphragm yields suiciently for said detent tip 42 to enterthe stop-notch 38, thereby anchoring said adjusting member againstrotation. The shaft `6 may now "be manually turnedto effect rotation ofthe eccentric 24 about the eccentric .'25, thereby -adjusting theeccentricity of the eccentric24. Release of the detent Apermits theflexible diaphragm to automatically withdraw the detent from .theadjusting member stop-notch.

It isto be understood that the present invention is not limited to thespecic eccentric-adjustment arrangement herein described or in fact tothe employment of the controlling member as a detent, as it will beobvious that the present improvement may be employed in various Ways asoil-tight means, free of working joints, for projecting a movable memberthrough a casing or frame of a mechanism-housing chamber.

Having thus set forth the nature ofthe invention, what I claim hereinis:-

1. A sewing machine having a frame includ- "ing a wall provided with aflexible section oill:tight with said wall, and a mechanism carried bysaid frame in position to be inuenced by the "exing o'f 4-said section.

2. A sewing machine having a frame including 'awall provided with animperforate exible section Dil-tight with said wall, and a mechanismcarried by said frame in position to be influenced by the flexing ofsaid section.

.3. A sewing .machine having atframe includ- .fing -a -wall providedwith a :flexible section oiltight with .said wall, ari-operative member-car- .ried by the flexible section of said Wal1,and a mechanism carriedby said frame in position to be acted upon bysaid 'operative member.

4.,-AseWing--machine having a frame including an apertured wall providedwith a flexible Vsection constituting `oil-tight sealing means for theapertureinvsaid wall, an operative member caryried by the ilexiblewall-section and shiftably disposed in the wall aperture, and amechanism.car ried by -said frame in Vposition ,to be influenced by theilexingof said section.

5. A sewing machine having a frame including va wall, an .operative.member .for transmitting :motion from one side to the other of saidWall, imperforate means comprising an oil-tight connection between saidwall .and zmember, and a mechanism carried .bysaid lframein .position tobe influenced uponfactuation of.said member.

6. A sewing machine having a mechanismhousing frame includinganapertured wall, an operativememloershiftably disposed in the aper-.ture of said wallto vextend Withnsaid framefor `cooper-ation withmechanismhoused thereby, and imperforate oil-tight sealingfmeansforsaidwall aperture.

'7. A sewing machine having a mechanism housing .frame4including.awallprovided with a flexible section `oil-tight with .saidwall, and an operative member actuable .from Vthe exterior of said frameand carried Aby `said flexible section for Ycooperation with mechanismwithin said frame.

8. A `sewing machine `having a Amechanismhousing .frame including a wall.provided with a metallic flexible section .oil-tight with said wall,and an operative member actuableirom the ex- -terior :of said frame andcarried .by said exible section for cooperation with mechanism within.said frame.

9. -A sewing `machine having .a `mechanism- Vhousing frame including a4detachable plate provided in an oil-tightmanner'with a 'flexiblesection, and a Vcontrolling rmember operable from the exterior 'of saidframe and carried by saidflexible 'section for cooperation withmechanism within said frame.

10. A sewing machine having a -frame includ- Ving a wall provided in 'anoil-tight manner with a flexible diaphragm, an adjusting member housedwithin said frame, and amanually operable :detent carried by saiddiaphragm to extend within said frame for cooperation with saidadjusting member.

11. A sewing machine having a mechanismhousing frame provided with anapertured wall, a controlling member manually operable from the exteriorof said wall and extending within said frame for cooperation withmechanism housed thereby, and a controlling member carrying flexiblediaphragm soldered to said wall to thereby seal the wall aperture.

12. A sewing machine having a frame, a feedeccentric and afeed-eccentric adjusting member disposed within said frame for relativemovement, a manually operable detent engageable with said adjustingmember and movable through said frame, and an oil-tight connectionbetween said detent and said frame providing for movement of said detentinto engagement with said adjusting member.

13. A sewing machine having a frame including a hollow work-arm providedwith a wall having an oil-tight flexible section, a rotary actuatingshaft extending into said work-arm, an eccentric carried by said shaftfor rotation therewith and for adjustment relatively thereto, aneccentric-adjusting member mounted upon said shaft for normal rotationwith and adapted to be restrained against rotation with said eccentric,and a manually operable detent carried by said exible section forengagement with said adjusting member.

14. A sewing machine having a frame including a hollow work-arm providedwith an apertured wall, a rotary actuating shaft extending into saidwork-arm, an eccentric carried by said shaft for rotation therewith andfor adjustment relatively thereto, an eccentric-adjusting member mountedupon said shaft for normal rotation with and adapted to be restrainedagainst rotation with said eccentric, a flexible diaphragm attached tothe under side of said apertured wall and providing an oil-tight sealfor the wall aperture, and a detent carried by said diaphragm forengagement with said adjusting member, said detent being accessiblydisposed for manual operation through said wall aperture.

15. A sewing machine having a mechanismhousing frame provided with anaperture, a flexible diaphragm attached to the inner wall of said frameand providing an oil-tight seal for said aperture, and an operativemember carried by said diaphragm for cooperation with mechanism withinsaid frame.

16. A sewing machine having a mechanismhousing frame including anapertured wall provided With an arched ilexible section having itsconvex wall proximate to the aperture in said Wall and its concave faceopposed to the mechanism within said frame, and an operative membercarried by said ilexible section for cooperation with mechanism withinsaid frame.

17. A sewing machine having a mechanismhousing frame including adetachable cover-plate provided with an aperture, a flexible archeddiaphragm accessible through said aperture and having a rim attached tothe inner face of said plate, and an operative member carried by saiddiaphragm for cooperation with mechanism within said frame.

18. A feed-off-arm sewing machine having a frame including asubstantially coplanar hollow Work-arm and a work-arm carrier arm, arotary shaft journaled in said carrier arm extending transversely of andinto said work-arm, feeding mechanism carried by said shaft within saidwork-arm including a feed-actuating eccentric and a feed-adjustingmember, a detent operable from the exterior of and through said work-armfor cooperation with said adjusting member, and oil-tight sealing meansfor said detent.

WALTER MYERS.

